douglas



p @uitrit tutes' ghe-tent @frnr JOSEPH w. -DOUG-LAs-OE :MIDDLETOWN CONNECTICUT, ASSIGNOE TO W. DOUGLAS AND E.` DOUGLAsOE SAME PLACE.

,Leners Parent No. 74,321, gated February 11, 1868.

IMPROVEMBN T IN PUMPS.'

TO ALL WHOM IT MAY' CONCERN:

Be it known that 1,5. WL DOUGLAS, of Middlctown, in the county of Middlesex, and State of Connecticut, have invented a new and useful Improvement in Pumps; and I do hereby declare that the following is a full and exact description thereof, w hieh will enablelothers skilled in the art to make and use the same, reference being had .to the accompanyingT drawing, forming part oi thisspecification;

This invention relates to a'new and useful improvement in pumps for domestc'or household use, such as are commonly termed yard-pumps and it'consists in the combination and arrangement of parts, as will he hereinafter described. y The accompanying drawing represents a vertical central section of. myinvention.-

. A represents'the upper portion of the barrel or cylinder of a pump, B the spout or nozzle, and C the airchamber on the top of the barrel or cylinder A. .On the top of the nir-chamber C, the stand D, in which the vlmnd-brake or' lever E is fitted, is placed, and allowed to turn freely, the stand being tted on n thimhle, F, secured to the top of the air-chamber, said thimble having a groove'made,circumferentially in'its exterior surface to receive a'set-screw, a, which passesthrough the lower end of the stand, as shown in the drawing. In

the upper end of the thimble, a. tubular screw, b, is tted, through which the piston-rod passes, said screw and the interior of the thimble F forming a. stuffing-box. The stand D, it will be seen, muy be turned on the airehnmber, and secured in any desired position relatively with the nozzle or spout B. In thc upper part of the l air-chamber there is a hole made, and tapped to receive a. screw, H, which is provideflwith a. shoulder, c, to fit,

when the screw is screwed fully up, against a plan'e'surface on the 4exterior of the air-chamber, aroundthe screw- Y hole, andl this plane surface has a number of holes, al, drilled through it, which holes, when the screw H is screwed outward, sopthat the shouldergc will not he in contact with the plane surfac'e on the exterior of the airohamber, will form a communicationbetween the' interior of the air-chamber and the external air. This screw,

therefore, performs the functionof avnlve, and when a force-pump` is not required, the screw-H is nnscrewed,

toadmit air to the air-chamber, and the pump will then operate like an ordinary lift-pump.

v Having thus described my invention, I claim ashew, and desire to secure'hy Letters Patent- The combination of the pump A, aircha.mher C, screw-pin H, thmble F, revolving stand D, andV tubular screw all arranged as described, for purpose speeied. l 4

JOS. W. DOUGLAS.

Witnesses:

JN0. M. DOUGLAS, GEo. M. SMITH. 

